23 questions
I will Element[] array = {new Element(1), new Element(2), new Element(3)};I initialized this arrangement ArrayList<Element> arraylist = ???;How do I put it in here?
ArrayList<String> places = new ArrayList<String>(); places.add(Buenos Aires); places.add(Córdoba); places.add(La Plata);For example, there is a source like this, and I want to reduce the i...
I don't know what the last value of ArrayList is. How do I get the last value of ArrayList?
ArrayList<Thing> basket = new ArrayList<Thing>(); Thing thing = new Thing(100); basket.add(thing); Thing another = new Thing(100); basket.contains(another); // true or false?class Thing { ...
To replace the Integer type ArrayList with an int type array List<Integer> x = new ArrayList<Integer>();int[] n = (int[])x.toArray(int[x.size()]);I did this, but there is a compilation err...
I'd like to remove all elements that have null values from the ArrayList or String array in JavaFor me,for (Tourist t : tourists) { if (t != null) { t.setId(idForm); } }I tried turning around the ...
You want to read a text file with a space character delimited value. What should I do? And how do you store that read value in an array list?For example, of the text file data .1 62 4 55 5 6 77I'd lik...
I want to know how to put an array in the Java arrayList. [] The square brackets are arraylist {} Braces are arrays[{array 0, array 1, array2} {array 0, array 1, array2}...{array0,array1,array2}] I wa...
Hello. I'm developing an Android app, and after selecting a check box in the Listview in my app, I need to put a specific text in the ArrayList and save that part, and then turn it back on using the s...
I'm making an alarm app using Android.Receiving multiple alarms from users was implemented, but the problem was caused by trying to display the set alarms on the screen.Normally, when we set multiple ...
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